| Abstract: | In this paper we study the variation of Vp/Vs and Poisson‘s ratio (??) in the Yellowstone National Park region, using earthquakes which were well recorded by a local seismic network. We find that the average Vp/Vs value within the geothermally active Yellowstone caldera is about 7% lower than in the area outside the caldera. Within the caldera itself there may be a further 2-7% reduction of Vp/Vs in the hydrothermally active Norris Geyser Basin, the Upper and Lower Geyser Basins, and the Yellowstone Lake and Mud Volcano regions. After considering various possible causes for Vp/Vs changes, such as geologic and structural differences, thermal effects, partial melting, and hydrothermal activity, we conclude that the most plausible explanation for the observed Vp/Vs reduction is the presence of hot-water at temperatures and pore-pressures near the water steam transition in the caldera geothermal reservoirs. ?? 1985. |
| Genre: | Article |
| ProdID: | 70013112 |
| Citation Author: | Chatterjee, S. N.; Pitt, A. M.; Iyer, H. M. |
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| Citation End Page: | 230 |
| Citation Issue: | 3-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Volcanology and Geothermal Research |
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| Citation Number Of Pages: | 18 |
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| Citation Search Results Text: | Vp/Vs ratios in the Yellowstone National Park region, Wyoming; 1985; Article; Journal; Journal of Volcanology and Geothermal Research; Chatterjee, S. N.; Pitt, A. M.; Iyer, H. M. |
| Citation Start Page: | 213 |
| Citation Volume: | 26 |
| Citation Year: | 1985 |
| Type: | citation/reference |
| Text: | Vp/Vs ratios in the Yellowstone National Park region, Wyoming; 1985; Article; Journal; Journal of Volcanology and Geothermal Research; Chatterjee, S. N.; Pitt, A. M.; Iyer, H. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 1985 00:00 -0600 |
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